Working on your car's ignition system? This spark plug tester is about to become your new best friend in the garage. The coolest feature? It's got TWO test holes so you can compare spark plugs side by side and see which ones are firing strong and which are ready for the trash. The working frequency goes from 0 all the way up to 6000 RPM - turn the dial and watch those sparks jump! Higher frequency means stronger sparks, so you can really see what's happening. There's a transparent safety cover that keeps sparks from flying everywhere (safety first, people!), plus indicator lights that show you exactly what's going on. It works with pretty much any 12mm spark plug from cars or motorcycles, and it's seriously easy to use - just plug in your spark plug, connect the power, and you're testing. Pro tip: do this in a darker area so you can see the sparks better. No more guessing whether your ignition problems are from bad plugs - this tester shows you exactly what's working and what isn't. Your tune-ups just got way more accurate!
Free 30-day returns 
Free 30-day returns
